Yielding matrix for sound-records.



V. H. EMERSON.

YIELDING MATRIX FOR SOUND RECORDS.

APPLICATION FILED JUNE 29, 1905.

PATENTBD FEB. 11. 1908.-

.. material.

UNITED STATES PATENT OFFICE.-

-'vIo !oE H: EMERSON, or NEW YORK, Y., AssIGNoE 'ro AMERICAN GRAPHOPHONE1 COMPANY, OF BRIDGEPORT, CONNECTICUT, A CORPORATION or WEST VIRGINIA.

4 YIELDING MATRIX FOR SOUND-RECORDS.

Specification of Letters Patent.

Patented Feb. 11, 1908.

Application filed June 29. 1905 Serial No. 267.590-

Matrices for Sound-Records, which improvement is fully set forth in thefollowing specification.

This invention relates to the production of sound-records by theimpressing of a suitable matrix into a disk or tablet of suitable Suchmatrices are electroplates, formed upon a wax-like original so und-recrd by the ordinary process of electrolysis.

These electroplates are comparatively thin sheets 'of metal which arebacked up by I heavy plates to which they aresoldered orotherwisepermanently secured. The surface of such matrix is seldom or never atrue geometric plane, so that if a composite tablet is to be impressed(to produce th sound record) some provision must be made to com- 7pensate for this Want of geometric trueness.

My present invention not only rovides this compensation, but also savest 1e time and expense of providing the heavy backing for the matrix, andincidentally permits a number of matrices to be stored in a small space.My invent on consists briefly in providing a yielding substance betweenthe matrix and the platen, or the plunger, of the press, so as toproduce a yielding matrix which -will press with uniform pressure uponevery ortion of the surface of the record or disk to which it isapplied. I

In the drawings annexed hereto to illustrate an embodin'cnt of myinvention, Figure 1 is a conventional representation of a presscontaining the invention.

Inthe press A is shown a recess containing a sheet of a body B, which isa sheet of. soft rubber, felt, cloth, or any yielding substance.

Upon this body B rests the electropla'te matrix C (a thin sheet ofelectro-deposited metal).

D represents the-record-tablet, which is to be impressed against thematrix b the plunger E of the press. Of course, t e plunger ormovablepart of the press might be the lower member, or both members, might bemade to. approach and recede from each other; and, in like manner, therecord-tablet may lie at the bottom with the matrix on top of that, andthe yielding bod B upon top of that; and also the yielding ody may beinterposed between the tablet B and the press, but the best results areobtainable by the construction shown.

Other changes and modifications may be employed, but the spirit of myinvention lies in employing in connection with the thin electroplate ormatrix a yieldin body between the back of said matrixan the press, so asto dispense with the heavy backing heretofore made integral with thematrix, and to compensate for any departure from absolute trueness ofeither the matrix surface or the record-tablet surface.

Having thus described my invention, I claim:

l. The combination with a press having two relatively-movable members ofa flexible electro-deposited matrix of a sound-record, a yieldin body atthe back bf said matrix between the same and one member of the press,and a tablet 0f comparatively rigid material for making a pressedsound-record on the other side ofsaid matrix and between the ingwitnesses.

VICTOR II. EMERSON. IVitne'sses C'. A. L. hIASSIE, R. L. Snow.

